<template>
  <div id="app">
    <div class="box">
      <div class="left"></div>
      <div class="mid"></div>
      <div class="right"></div>
    </div>
  </div>
</template>

<script>
import HelloWorld from './components/HelloWorld.vue'

export default {
  name: 'App',
}
</script>

<style lang="less" scoped>
#app {
 .box {
   display: flex;
   width: 100%;
   height: 60vh;
   flex: 1;
.left {
  flex: 1;
  background-color: blue;
    }
    .mid {
  flex: 1;
  background-color: pink;
    }
    .right {
  flex: 1;
  background-color: yellowgreen;

    }
  }
}

</style>
